USDA reference food · Vegetables and Vegetable Products
Onions, raw
1 medium of onions, raw (110 g) has 45 calories, 1g of protein, 0g of fat and 2g of fiber (USDA FoodData Central, SR Legacy, FDC 170000). It is one of 14 USDA descriptions of onions.
FoodData Central 170000, SR Legacy, in the April 30, 2026 release; USDA record.
Nutrition Facts
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice. Protein % DV here is not corrected for protein quality.
USDA values per 100 g (SR Legacy), scaled to the portion. Check the USDA record.
- Protein per 100 g
- 1.1g
- more than 17% of 8,218 USDA reference foods
- Calories per 100 g
- 40
- more than 10% of reference foods
- Fiber per 100 g
- 1.7g
- more than 66% of reference foods
What a portion gives you
Ticks: 5% of the Daily Value (FDA: low) and 20% (high)
Source: USDA FoodData Central, SR Legacy (FDC 170000); FDA Daily Values, 21 CFR 101.9.
Where the calories come from: 88% carbohydrate, 2% fat and 10% protein (4 calories a gram of protein or carbohydrate, 9 of fat).
Where it sits among USDA reference foods
| Per 100 g | This food | Share with less |
|---|---|---|
| Calories | 40.0 | 10% |
| Protein | 1.10 g | 17% |
| Total fat | 0.10 g | 7% |
| Carbohydrate | 9.34 g | 54% |
| Fiber | 1.70 g | 66% |
| Total sugars | 4.24 g | 67% |
| Sodium | 4.00 mg | 10% |
Source: USDA FoodData Central, SR Legacy and Foundation Foods: the 6,012 to 8,218 reference foods that report each value; the share of them with less per 100 g.
Every nutrient in this record (115)
The portion is 1 medium (110 g); % DV is for that portion.
Energy, macronutrients and sugars (21)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Protein | 1.21 g | 1.10 g | 2% |
| Total lipid (fat) | 0.11 g | 0.10 g | 0% |
| Carbohydrate, by difference | 10.3 g | 9.34 g | 4% |
| Ash | 0.39 g | 0.35 g | |
| Energy | 44.0 kcal | 40.0 kcal | |
| Starch | 0 g | 0 g | |
| Sucrose | 1.09 g | 0.99 g | |
| Glucose | 2.17 g | 1.97 g | |
| Fructose | 1.42 g | 1.29 g | |
| Lactose | 0 g | 0 g | |
| Maltose | 0 g | 0 g | |
| Alcohol, ethyl | 0 g | 0 g | |
| Water | 98.0 g | 89.1 g | |
| Total Sugars | 4.66 g | 4.24 g | |
| Galactose | 0 g | 0 g | |
| Fiber, total dietary | 1.87 g | 1.70 g | 7% |
| Cholesterol | 0 mg | 0 mg | 0% |
| Fatty acids, total trans | 0 g | 0 g | |
| Fatty acids, total saturated | 0.046 g | 0.042 g | 0% |
| Fatty acids, total monounsaturated | 0.014 g | 0.013 g | |
| Fatty acids, total polyunsaturated | 0.019 g | 0.017 g |
Minerals (11)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Calcium, Ca | 25.3 mg | 23.0 mg | 2% |
| Iron, Fe | 0.23 mg | 0.21 mg | 1% |
| Magnesium, Mg | 11.0 mg | 10.0 mg | 3% |
| Phosphorus, P | 31.9 mg | 29.0 mg | 3% |
| Potassium, K | 161 mg | 146 mg | 3% |
| Sodium, Na | 4.40 mg | 4.00 mg | 0% |
| Zinc, Zn | 0.19 mg | 0.17 mg | 2% |
| Copper, Cu | 0.043 mg | 0.039 mg | 5% |
| Fluoride, F | 1.21 µg | 1.10 µg | |
| Manganese, Mn | 0.14 mg | 0.13 mg | 6% |
| Selenium, Se | 0.55 µg | 0.50 µg | 1% |
Vitamins (33)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Retinol | 0 µg | 0 µg | |
| Vitamin A, RAE | 0 µg | 0 µg | 0% |
| Carotene, beta | 1.10 µg | 1.00 µg | |
| Carotene, alpha | 0 µg | 0 µg | |
| Vitamin E (alpha-tocopherol) | 0.022 mg | 0.020 mg | 0% |
| Vitamin D (D2 + D3) | 0 µg | 0 µg | 0% |
| Cryptoxanthin, beta | 0 µg | 0 µg | |
| Lycopene | 0 µg | 0 µg | |
| Lutein + zeaxanthin | 4.40 µg | 4.00 µg | |
| Tocopherol, beta | 0 mg | 0 mg | |
| Tocopherol, gamma | 0 mg | 0 mg | |
| Tocopherol, delta | 0 mg | 0 mg | |
| Tocotrienol, alpha | 0.044 mg | 0.040 mg | |
| Tocotrienol, beta | 0 mg | 0 mg | |
| Tocotrienol, gamma | 0 mg | 0 mg | |
| Tocotrienol, delta | 0 mg | 0 mg | |
| Vitamin C, total ascorbic acid | 8.14 mg | 7.40 mg | 9% |
| Thiamin | 0.051 mg | 0.046 mg | 4% |
| Riboflavin | 0.030 mg | 0.027 mg | 2% |
| Niacin | 0.13 mg | 0.12 mg | 1% |
| Pantothenic acid | 0.14 mg | 0.12 mg | |
| Vitamin B-6 | 0.13 mg | 0.12 mg | 8% |
| Folate, total | 20.9 µg | 19.0 µg | |
| Vitamin B-12 | 0 µg | 0 µg | 0% |
| Choline, total | 6.71 mg | 6.10 mg | 1% |
| Vitamin K (Dihydrophylloquinone) | 0 µg | 0 µg | |
| Vitamin K (phylloquinone) | 0.44 µg | 0.40 µg | 0% |
| Folic acid | 0 µg | 0 µg | |
| Folate, food | 20.9 µg | 19.0 µg | |
| Folate, DFE | 20.9 µg | 19.0 µg | 5% |
| Betaine | 0.11 mg | 0.10 mg | |
| Vitamin E, added | 0 mg | 0 mg | |
| Vitamin B-12, added | 0 µg | 0 µg |
Amino acids (18)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| Tryptophan | 0.015 g | 0.014 g | |
| Threonine | 0.023 g | 0.021 g | |
| Isoleucine | 0.015 g | 0.014 g | |
| Leucine | 0.028 g | 0.025 g | |
| Lysine | 0.043 g | 0.039 g | |
| Methionine | 0.0022 g | 0.0020 g | |
| Cystine | 0.0044 g | 0.0040 g | |
| Phenylalanine | 0.028 g | 0.025 g | |
| Tyrosine | 0.015 g | 0.014 g | |
| Valine | 0.023 g | 0.021 g | |
| Arginine | 0.11 g | 0.10 g | |
| Histidine | 0.015 g | 0.014 g | |
| Alanine | 0.023 g | 0.021 g | |
| Aspartic acid | 0.10 g | 0.091 g | |
| Glutamic acid | 0.28 g | 0.26 g | |
| Glycine | 0.028 g | 0.025 g | |
| Proline | 0.013 g | 0.012 g | |
| Serine | 0.023 g | 0.021 g |
Fatty acids (30)
| Nutrient | Per portion | Per 100 g | % DV |
|---|---|---|---|
| SFA 4:0 | 0 g | 0 g | |
| SFA 6:0 | 0 g | 0 g | |
| SFA 8:0 | 0 g | 0 g | |
| SFA 10:0 | 0 g | 0 g | |
| SFA 12:0 | 0 g | 0 g | |
| SFA 14:0 | 0.0044 g | 0.0040 g | |
| SFA 16:0 | 0.037 g | 0.034 g | |
| SFA 18:0 | 0.0044 g | 0.0040 g | |
| SFA 20:0 | 0 g | 0 g | |
| MUFA 18:1 | 0.014 g | 0.013 g | |
| PUFA 18:2 | 0.014 g | 0.013 g | |
| PUFA 18:3 | 0.0044 g | 0.0040 g | |
| PUFA 20:4 | 0 g | 0 g | |
| PUFA 22:6 n-3 (DHA) | 0 g | 0 g | |
| SFA 22:0 | 0 g | 0 g | |
| MUFA 14:1 | 0 g | 0 g | |
| MUFA 16:1 | 0 g | 0 g | |
| PUFA 18:4 | 0 g | 0 g | |
| MUFA 20:1 | 0 g | 0 g | |
| PUFA 20:5 n-3 (EPA) | 0 g | 0 g | |
| MUFA 22:1 | 0 g | 0 g | |
| PUFA 22:5 n-3 (DPA) | 0 g | 0 g | |
| Phytosterols | 16.5 mg | 15.0 mg | |
| SFA 15:0 | 0 g | 0 g | |
| SFA 17:0 | 0 g | 0 g | |
| SFA 24:0 | 0 g | 0 g | |
| PUFA 20:2 n-6 c,c | 0 g | 0 g | |
| MUFA 17:1 | 0 g | 0 g | |
| PUFA 20:3 | 0 g | 0 g | |
| MUFA 15:1 | 0 g | 0 g |
Source: USDA FoodData Central, FDC 170000: every value the record reports, per 100 g as USDA gives it and scaled to the portion; Daily Values: 21 CFR 101.9.
Other ways to eat onions
USDA lists 14 preparations of onions. The onions page puts them side by side, per 100 g and per portion.
Next questions
- Every common food in vegetables and vegetable productscalories, protein, fat and carbohydrate side by side
- Foods A to Z
- Compare two foods side by sidecalories, sugar, sodium and protein per 100 g and per portion
Sources for this page
- USDA FoodData Central
- this record and every record it is compared with, April 30, 2026 release. fdc.nal.usda.gov
- FoodData Central documentation
- what branded, SR Legacy, Foundation and survey records are. fdc.nal.usda.gov
- USDA Food and Nutrient Database for Dietary Studies
- survey foods and their household portions. ars.usda.gov
- 21 CFR 101.9, Nutrition labeling of food
- the label format, its rounding and the Daily Values. ecfr.gov
- 21 CFR 101 subpart D, Nutrient content claims
- the FDA thresholds the comparisons count. ecfr.gov
- FDA, How to Understand and Use the Nutrition Facts Label
- the 5% and 20% Daily Value rule. fda.gov